Frequency discrimination method and device for automatic frequency controller in diversity mode

A technology of automatic frequency control and diversity mode, applied in the direction of selection device, code division multiplexing system, radio/inductive link selection arrangement, etc., can solve the problems of slow acquisition speed and inability to obtain correct frequency difference, etc. To achieve the effect of simplifying the design
CN1396732AInactive Publication Date: 2003-02-12HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2003-02-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

A frequency discriminating method for AFC circuit in diversity mode includes such steps as deleting the head data of a first frame, filling zero to frame head and tail to generate continuous frequency difference detecting pairs, cross-multiplying the input signals of cross-multiplier, sending the said detecting pairs to the frequency discriminator to obtain frequency difference, and over sampling to obtain 2x samples for output. Its advantages are simple equipment and high speed.
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Description

technical field

[0001] The invention belongs to the technical field of synchronous application in communication technology, and more specifically relates to a frequency discrimination method and a device for an automatic frequency control circuit. Background technique

[0002] In a WCDMA user terminal (WCDMA UE), a Common Pilot Channel (CPICH) signal is used to obtain frequency difference information to implement an Automatic Frequency Control (AFC) function. Sequence of symbols transmitted by CPICH. In the non-diversity mode, only one antenna transmits a symbol sequence, and in the diversity mode, two antennas transmit simultaneously. These contents are described in more detail in the 3GPP protocol TS25.211 V3.6.0 published in March 2001.

[0003] In this way, in the non-diversity mode, the AFC circuit can adopt a frequency discriminator structure (take the cross-product frequency discriminator as an example), and the frequency difference can be obtained by taking the imag...

Claims

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